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问Boost绑定AIX xlc io_service运行
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Stack Overflow用户

提问于 2013-02-21 10:25:56

回答 4查看 739关注 0票数 0

我正在尝试使用boost编译项目，将asio::io_service绑定到boost::thread，并且收到一些我不知道如何解决的错误: IBM XL C/C++ for AIX，V11.1 (5724-X13)，Version: 11.01.0000.0006 (AIX 7.1)

    "/home/clag/projects/tomas/include/boost/asio/detail/posix_fd_set_adapter.hpp", line 33.30: 1540-0198 (W) The omitted keyword "private" is assumed for base class "noncopyable".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.46: 1540-0219 (S) The call to "boost::bind" has no best match.
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.58: 1540-1229 (I) Argument number 1 is an rvalue of type "overloaded function: boost::asio::io_service::run".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.100: 1540-1229 (I) Argument number 2 is an rvalue of type "const boost::reference_wrapper<const boost::asio::io_service>".
    "/home/clag/projects/tomas/include/boost/bind/bind_mf_cc.hpp", line 30.5: 1540-1202 (I) No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::reference_wrapper<const boost::asio::io_service> >(unsigned long (io_service::*)() const, reference_wrapper<const boost::asio::io_service>)".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.58: 1540-1231 (I) The conversion from argument number 1 to "unsigned long (boost::asio::io_service::*)() const" uses the resolved overloaded function "size_t boost::asio::io_service::run()".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.100: 1540-1231 (I) The conversion from argument number 2 to "boost::reference_wrapper<const boost::asio::io_service>" uses "the identity conversion".
    "/home/clag/projects/tomas/include/boost/bind/bind_mf_cc.hpp", line 20.5: 1540-1202 (I) No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::reference_wrapper<const boost::asio::io_service> >(unsigned long (io_service::*)(), reference_wrapper<const boost::asio::io_service>)".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.58: 1540-1231 (I) The conversion from argument number 1 to "unsigned long (boost::asio::io_service::*)()" uses the resolved overloaded function "size_t boost::asio::io_service::run()".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 50.100: 1540-1231 (I) The conversion from argument number 2 to "boost::reference_wrapper<const boost::asio::io_service>" uses "the identity conversion".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.35: 1540-0219 (S) The call to "boost::bind" has no best match.
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.47: 1540-1229 (I) Argument number 1 is an rvalue of type "overloaded function: boost::asio::io_service::run".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.98: 1540-1229 (I) Argument number 2 is an rvalue of type "boost::asio::io_service *".
    "/home/clag/projects/tomas/include/boost/bind/bind_mf_cc.hpp", line 30.5: 1540-1202 (I) No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::asio::io_service *>(unsigned long (io_service::*)() const, io_service *)".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.47: 1540-1231 (I) The conversion from argument number 1 to "unsigned long (boost::asio::io_service::*)() const" uses the resolved overloaded function "size_t boost::asio::io_service::run()".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.98: 1540-1231 (I) The conversion from argument number 2 to "boost::asio::io_service *" uses "the identity conversion".
    "/home/clag/projects/tomas/include/boost/bind/bind_mf_cc.hpp", line 20.5: 1540-1202 (I) No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::asio::io_service *>(unsigned long (io_service::*)(), io_service *)".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.47: 1540-1231 (I) The conversion from argument number 1 to "unsigned long (boost::asio::io_service::*)()" uses the resolved overloaded function "size_t boost::asio::io_service::run()".
    "/home/clag/projects/tomas/ots/src/agent/agent.cc", line 52.98: 1540-1231 (I) The conversion from argument number 2 to "boost::asio::io_service *" uses "the identity conversion".
    "/home/clag/projects/tomas/include/boost/asio/impl/write.hpp", line 276.7: 1540-0198 (W) The omitted keyword "private" is assumed for base class "detail::base_from_completion_cond<CompletionCondition>".
    "/home/clag/projects/tomas/include/boost/asio/impl/write.hpp", line 276.7: 1540-0198 (W) The omitted keyword "private" is assumed for base class "detail::base_from_completion_cond>boost::asio::detail::transfer_all_t>"

导致错误的代码：

    acceptor_thread_.reset(new boost::thread(boost::bind(&boost::asio::io_service::run, boost::cref(*accept_io_service_))));
    for (int i = 0; i < agent_config_.threads(); i++) {
        thread_group_.create_thread(boost::bind(&boost::asio::io_service::run, work_io_service_.get()));
    }

定义：

    boost::shared_ptr<boost::asio::io_service> accept_io_service_;
    boost::shared_ptr<boost::thread> acceptor_thread_;
    boost::shared_ptr<boost::asio::io_service> work_io_service_;
    boost::thread_group thread_group_;

顺便提一下，这可能只是一个标志选项，但我在任何地方都找不到它，因为相同的代码在Linux(GCC)、HP-UX(aCC)和Windows(MSVC)上编译得很好。

Thx请求帮助

boost-asio

aix

boost-bind

xlc

回答 4

Stack Overflow用户

回答已采纳

发布于 2013-02-21 16:30:22

google快速搜索表明AIX在重载解析方面存在问题，尤其是在涉及模板的情况下。因此，尝试不同的方法来减少需要发生的重载分辨率的数量可能是值得的。

例如，可以用boost::mem_fn()代替boost::bind()。

std::size_t (io_service::*run)() = &io_service::run;
boost::thread t(boost::mem_fn(run), io_service);

此外，如果编译器在解决重载时仍然有问题，那么可以考虑编写一个简单的functor。boost::thread()构造函数的唯一要求是func参数是可复制的，并且func()必须是有效的表达式。

struct service_runner
{
  explicit service_runner(boost::shared_ptr<boost::asio::io_service> io_service)
    : io_service(io_service)
  {}
  std::size_t operator()() { return io_service->run(); }
  boost::shared_ptr<boost::asio::io_service> io_service;
};

...

boost::thread t((service_runner(io_service)));

其他需要考虑的问题：

更喜欢编译符合标准的代码，而不是使用编译器标志来允许不符合标准的代码进行编译。在本例中，io_service::run()是一个非常数成员函数，但绑定到它的accept_io_service实例参数作为常量引用通过boost::cref()传递。需要添加编译器标志，如gcc的-fpermissive，以允许编译不符合规范的代码。在使用这些选项时要非常小心，因为它们可能会屏蔽将boost::shared_ptr作为实例句柄传递给绑定调用的严重problems.
Consider。这将使io_service保持活动状态，只要线程仍在运行。否则，该io_service可能会在线程仍在处理其事件循环时被删除，从而导致调用未定义行为的可能性很高。

票数 2

Stack Overflow用户

发布于 2013-02-25 16:41:30

只是出于好奇，您是否正在为您正在使用的编译器使用IBM boost库补丁？http://www-01.ibm.com/support/docview.wss?uid=swg27006911

票数 1

Stack Overflow用户

发布于 2013-02-25 16:59:35

查看尝试的4个可能候选者的消息，差异似乎与const相关

No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::reference_wrapper<const boost::asio::io_service> >(unsigned long (io_service::*)() const, reference_wrapper<const boost::asio::io_service
>)".
No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::reference_wrapper<const boost::asio::io_service> >(unsigned long (io_service::*)(), reference_wrapper<const boost::asio::io_service>)".
No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::asio::io_service *>(unsigned long (io_service::*)() const, io_service *)".
No candidate is better than "boost::bind<unsigned long,boost::asio::io_service,boost::asio::io_service *>(unsigned long (io_service::*)(), io_service *)".